Really? This would be the first I have ever heard of it.
It’s the holy grail of an-cap’ism. 
Does this child telepathically operate a typewriter and produce 70 pages a day?
I think Walter Block once mentioned in one of his audio lectures/speeches, that he (Block) was happy about being able to write a page an hour. He then called Rothbard, and Rothbard told him that he (Rothbard) wrote 8 pages an hour and never hit the “backspace” button.
Yes I remember that one. The man could write over 50 pages in a day. The very reason I said that comparing yourself to Rothbard is coming dangerously close to the nirvana fallacy.